Nonthermal Plasma Jet for Biomedical Applications

Low-temperature plasma has been successfully used in medicine for last 15 years. Cure of purulent wounds by means of discharge plasma with low gas temperature is a new method of medical drug-free treatment. A result of investigation of atmospheric pressure helium plasma-jet excited by capacitive discharges at various method of excitation is presented. Homogenous discharge of plasma jet and 34∘C of gas temperature at helium flow 0.5L/min was achieved at short pulsed voltage excitation. Keywords: plasma jet, nonthermal plasma, medical drug-free treatment, inactivation, pathogen

Cooling techniques for excilamps driven by dielectric barrier discharge

Our study describes effective techniques to transfer heat away from UV emitters based on dielectric barrier discharge excilamps. It presents findings from an investigation into the efficiency of excilamp radiation when cooled by air, inert gas, and liquid refrigerants. The devised cooling techniques were used to create radiation sources with a UV power density of up to 117 mW∕cm2

Опыт применения эксимерной лампы, оснащённой системой контроля UVB дозы, в дерматологии

Intermediate ultraviolet (UVB) therapy is considered a relatively safe method of treating skin diseases with an autoimmune component in development compared to medical drug methods, including PUVA therapy. This is due to the small depth of penetration of the rays of this wavelength range into skin, which provides a purely local effect on the human body. Excimer lamps are an alternative to the expensive excimer laser for phototherapy of psoriasis or vitiligo. However, for effective phototherapy using UVB lamps, the distance from an emitter to a patient’s skin must be considered. In this paper, we report on treatment of patients using an excimer lamp, the control unit of which is equipped with an optical system for controlling of ultraviolet radiation dose, which allows automatically calculating the time for a set UVB dose. The article describes the results of phototherapy using an excimer lamp of several cases of psoriasis, vitiligo and other forms of dermatitis with a good therapeutic and cosmetic effect. When using an excimer lamp, not a single case of exacerbation of dermatological diseases was established.UVB терапия считается относительно безопасным способом лечения кожных заболеваний с аутоиммунным компонентом в развитии в сравнении с медикаментозными методами, включая ПУВА терапию. Это обусловлено малой глубиной проникновения лучей данного диапазона длин волн в кожный покров, что обеспечивает сугубо локальное воздействие на организм человека. Эксимерные лампы являются альтернативой дорогостоящему эксимерному лазеру при фототерапии псориаза и витилиго. Однако для эффективной фототерапии с использованием UVB ламп необходимо учитывать расстояние от излучателя до кожи пациента. В данной работе сообщается о лечении больных с использованием эксимерной лампы, блок управления которой снабжён оптической системой контроля дозы ультрафиолетового излучения, что позволяет автоматически производить расчёт времени сеанса для заданной UVB дозы. В статье приведено описание результатов фотолечения с использованием эксимерной лампы нескольких случаев псориаза, витилиго и других форм дерматитов с хорошим терапевтическим и косметическим эффектом. При использовании эксимерной лампы не установлено ни одного случая обострения дерматологических заболеваний

Temperature Distribution of Particles in a Laser Beam

This article studies the particle temperature distribution depending on the laser radiation power and the particle’s trajectory and velocity. The uneven heating of particles moving in the laser radiation field is identified. The regimes of laser heating without melting, with partial melting, and with complete particle melting are considered

Experience of using an excimer lamp equipped with UVB dose control system in dermatology

Intermediate ultraviolet (UVB) therapy is considered a relatively safe method of treating skin diseases with an autoimmune component in development compared to medical drug methods, including PUVA therapy. This is due to the small depth of penetration of the rays of this wavelength range into skin, which provides a purely local effect on the human body. Excimer lamps are an alternative to the expensive excimer laser for phototherapy of psoriasis or vitiligo. However, for effective phototherapy using UVB lamps, the distance from an emitter to a patient’s skin must be considered. In this paper, we report on treatment of patients using an excimer lamp, the control unit of which is equipped with an optical system for controlling of ultraviolet radiation dose, which allows automatically calculating the time for a set UVB dose. The article describes the results of phototherapy using an excimer lamp of several cases of psoriasis, vitiligo and other forms of dermatitis with a good therapeutic and cosmetic effect. When using an excimer lamp, not a single case of exacerbation of dermatological diseases was established

Investigation of Nonthermal Plasma Jet Excitation Mode and Optical Assessment of Its Electron Concentration

The results of a study of a plasma jet of atmospheric-pressure helium driven by a capacitive discharge using sine and pulsed modes of excitation are presented. The homogeneous discharge of a multi-channel plasma jet at gas temperature of 34 °C and helium flow rate of 0.5 L/min was achieved with short pulse excitation. A digital holography method is proposed to estimate a basic plasma parameter, i.e., its electron concentration. An automated digital holographic interferometry set-up for the observation and study of a nonthermal plasma jet in a pulse mode is developed and described. The synchronization features of recording devices with the generation of plasma pulses are considered. The electron concentration of the plasma jet is also estimated. The disadvantages of the proposed technique and its further application are discussed

Enhancing wettability and adhesive properties of PVDF-based substrates through non-thermal helium plasma surface modification

Polyvinylidene fluoride (PVDF) has gained attention as a promising material for tissue engineering due to its biocompatibility and piezoelectricity. However, achieving proper cell adhesion to PVDF surfaces remains a challenge. This study focuses on the preparation and characterization of PVDF-based substrates, including PVDF thin films and nanocomposites incorporating CoFe2O4 magnetic nanoparticles. Helium plasma treatment is employed to modify the surface properties of these substrates. The plasma treatment induces significant changes in the topography of the PVDF-based nanocomposites. The roughness values of the samples increase from 2–3 nm to 14–17 nm after 90 s of plasma treatment, leading to enhanced hydrophilicity with an average contact angle below 60°. Importantly, the helium plasma treatment preserves the magnetic and structural properties of the substrates, suggesting the retention of their magnetoelectric properties and, thus treated composites hold potential for remote stem cell activation. We provide evidence of cytocompatibility and improved adhesive properties of plasma-treated substrates using human mesenchymal stem cell cultures